diff --git a/src/lagrangian/cfdemParticle/subModels/forceModel/Fines/FinesFields.C b/src/lagrangian/cfdemParticle/subModels/forceModel/Fines/FinesFields.C
index 0979e7c9..d17aabb5 100644
--- a/src/lagrangian/cfdemParticle/subModels/forceModel/Fines/FinesFields.C
+++ b/src/lagrangian/cfdemParticle/subModels/forceModel/Fines/FinesFields.C
@@ -54,7 +54,11 @@ FinesFields::FinesFields
     velFieldName_(propsDict_.lookupOrDefault<word>("velFieldName","U")),
     U_(sm.mesh().lookupObject<volVectorField> (velFieldName_)),
     voidfractionFieldName_(propsDict_.lookupOrDefault<word>("voidfractionFieldName","voidfraction")),
+#if OPENFOAM_VERSION_MAJOR < 5
+    voidfraction_(const_cast<volScalarField&>(sm.mesh().lookupObject<volScalarField>(voidfractionFieldName_))),
+#else
     voidfraction_(sm.mesh().lookupObjectRef<volScalarField> (voidfractionFieldName_)),
+#endif
     UsFieldName_(propsDict_.lookupOrDefault<word>("granVelFieldName","Us")),
     UsField_(sm.mesh().lookupObject<volVectorField> (UsFieldName_)),
     pFieldName_(propsDict_.lookupOrDefault<word>("pFieldName","p")),
diff --git a/src/lagrangian/cfdemParticle/subModels/forceModel/particleCellVolume/particleCellVolume.C b/src/lagrangian/cfdemParticle/subModels/forceModel/particleCellVolume/particleCellVolume.C
index 26b7035b..c8aca4b0 100644
--- a/src/lagrangian/cfdemParticle/subModels/forceModel/particleCellVolume/particleCellVolume.C
+++ b/src/lagrangian/cfdemParticle/subModels/forceModel/particleCellVolume/particleCellVolume.C
@@ -102,7 +102,7 @@ particleCellVolume::particleCellVolume
     if(writeToFile_)
     {
         fileName path(particleCloud_.IOM().createTimeDir("postProcessing/particleCellVolume"));
-        filePtr_ = new OFstream(path/"particleCellVolume.txt");
+        filePtr_.set(new OFstream(path/"particleCellVolume.txt"));
         filePtr_() << "# time | total particle volume in cells | total volume of cells with particles | average volume fraction | min(voidfraction) | max(voidfraction)" << endl;
     }
 }
diff --git a/src/lagrangian/cfdemParticle/subModels/forceModel/volWeightedAverage/volWeightedAverage.C b/src/lagrangian/cfdemParticle/subModels/forceModel/volWeightedAverage/volWeightedAverage.C
index 499ad439..5a5be281 100644
--- a/src/lagrangian/cfdemParticle/subModels/forceModel/volWeightedAverage/volWeightedAverage.C
+++ b/src/lagrangian/cfdemParticle/subModels/forceModel/volWeightedAverage/volWeightedAverage.C
@@ -131,7 +131,7 @@ volWeightedAverage::volWeightedAverage
     if(writeToFile_)
     {
         fileName path(particleCloud_.IOM().createTimeDir("postProcessing/volWeightedAverage"));
-        filePtr_ = new OFstream(path/"volWeightedAverage.txt");
+        filePtr_.set(new OFstream(path/"volWeightedAverage.txt"));
     }
 }